$OpenBSD: patch-third_party_WebKit_Source_platform_heap_StackFrameDepth_cpp,v 1.9 2017/04/19 05:16:47 robert Exp $
--- third_party/WebKit/Source/platform/heap/StackFrameDepth.cpp.orig.port	Fri Mar 10 10:07:30 2017
+++ third_party/WebKit/Source/platform/heap/StackFrameDepth.cpp	Fri Mar 10 10:07:57 2017
@@ -15,6 +15,11 @@
 extern "C" void* __libc_stack_end;  // NOLINT
 #endif
 
+#if OS(OPENBSD)
+#include <sys/signal.h>
+#include <pthread_np.h>
+#endif
+
 namespace blink {
 
 static const char* s_avoidOptimization = nullptr;
